EP0384148B1 - A door locking means for a washing or drying machine for laundry - Google Patents

A door locking means for a washing or drying machine for laundry Download PDF

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Publication number
EP0384148B1
EP0384148B1 EP90101499A EP90101499A EP0384148B1 EP 0384148 B1 EP0384148 B1 EP 0384148B1 EP 90101499 A EP90101499 A EP 90101499A EP 90101499 A EP90101499 A EP 90101499A EP 0384148 B1 EP0384148 B1 EP 0384148B1
Authority
EP
European Patent Office
Prior art keywords
door
inputs
locking means
machine
washing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP90101499A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0384148A1 (en
Inventor
Giuseppe Frucco
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Industrie Zanussi SpA
Original Assignee
Industrie Zanussi SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Industrie Zanussi SpA filed Critical Industrie Zanussi SpA
Priority to AT90101499T priority Critical patent/ATE89044T1/de
Publication of EP0384148A1 publication Critical patent/EP0384148A1/en
Application granted granted Critical
Publication of EP0384148B1 publication Critical patent/EP0384148B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/42—Safety arrangements, e.g. for stopping rotation of the receptacle upon opening of the casing door

Definitions

  • the present invention relates to a door locking means for a washing or drying machine for laundry, that is adapted to permit opening of the locked door at the end of, or during, each selected washing or drying cycle in accordance with the attainment of predetermined safe operating conditions within the machine.
  • a door locking means adapted to keep the door locked for the entire duration of the washing or drying cycle selected, thereby preventing the door from being opened accidentally during the run of the cycle, which could harm the user due to the elevated temperature within the machine and/ or the rotation of the drum.
  • Door locking means of various kinds are known f.e. from the documents DE 2029941 and DE 2163449 which comprise an electromechanical actuator, such as a bimetallic element, a relay or a similar element, subject to the programmer-timer of the machine and provided with a pin interacting with the lock of the door, said actuator being adapted to be driven into two different operating positions by said programmer-timer, namely a first position in which the actuator is idle and moves the pin into a position of rest in which the latter does not interfere with the lock of the door, thereby allowing the door to be opened or closed, and a second position in which the actuator is acitvated and moves the pin into a working position in which the latter interferes with the lock, thereby preventing the door from being moved.
  • an electromechanical actuator such as a bimetallic element, a relay or a similar element
  • Such locking means furthermore comprise a conventional delay element associated with the electromechanical actuator and calibrated to activate the latter after a predetermined delay time following the end of the last spinning or drying phase of the selected cycle, allowing the door of the machine to be opened when the drum has stopped and therefore eliminating any danger of injury for the user in contact with the drum.
  • This delay time can be relatively long (in the range of about 30 to 50 seconds), particularly when the drum of the washing machine is loaded with considerable amounts of laundry and is driven at high spinning speeds, so that it requires a longer period of time to stop after the end of the last spinning phase of the cycle.
  • the conventional locking means would nevertheless ensure the opening of the door independently of the temperature states and the washing bath level present within the machine. Consequently, these locking means are not capable of checking the temperature states and the washing bath level present within the machine and thus guaranteeing effective safety of the machine by preventing the door from being opened when these temperatures and levels could cause situations dangerous for the persons (scalding, etc.) and harmful for the surroundings (overflowing, etc.).
  • This locking means is in particular designed to measure the states of the temperature and washing bath levels within the machine and to allow the lock of the machine door to be unlocked, and thus the door to be opened, only when the levels are below predetermined minimum values, so as to ensure effective safety for the user.
  • this means substantially comprises three electronic comparators 1, 2, 3 of the conventional type, a logical NOR gate 4 connected operatively following the comparators in the way and for the purposes as described below, and an electromechanical actuator 5 to be activated by NOR gate 4 and associated with a pin 6 interacting with lock 7 of the machine door to keep the door (when it is closed) in the locked position, or release it.
  • Electronic comparators 1, 2, 3 are in particular respectively provided to perform a comparison between the effective value and a predetermined reference value of the temperature and the load level of the washing bath within the tank of the washing machine, and of the rotating speed of the drum of the machine, and are also provided to effect the locking or unlocking of lock 7 of the door in accordance with the result of this comparison.
  • comparators 1, 2, 3 are provided respectively with first inputs 8, 9, 10 which are subjected to voltages proportional to the effective values of the quantities to be controlled, via respective measuring transducers 11, 12, 13 of the conventional type connected to respective probes (not shown) provided within the machine to detect the quantities, and with respective second inputs 14, 15, 16 which are subjected to reference voltages of predetermined fixed values proportional to the final values to be obtained for the particular quantities to be controlled and selected in such a way as to attain safe operating states in the machine.
  • the values of the reference voltages of inputs 14, 15, 16 of corresponding comparators 1, 2, 3 are selected to effect, respectively, a maximum temperature of 40°C and a washing bath level in the tank that is lower than the edge of the access opening of the machine, so that the door can be opened without any danger of the user being burned and the washing bath overflowing to the outside, and a maximum rotating speed of the drum of 53 rpm, this drum rotating speed not being dangerous for the user.
  • This drum rotating speed can in particular be advantageously obtained by measuring the voltage generated by a tacho generator connected to the electric motor of the machine, this voltage therefore being proportional to the speed of the motor.
  • comparators 1, 2, 3 are provided respectively with outputs 17, 18, 19 connected with corresponding inputs 20, 21, 22 of logical NOR gate 4, while logical NOR gate 4 is provided with an output 23 connected via a limiting resistor 24 with base 25 of a transistor 26 having emitter 27 connected to ground and collector 28 connected with d.c. voltage Vcc of predetermined value, via an electromagnet 29 disposed in parallel with a diode 30.
  • electromagnet 29 interacts with an electric contact 31 of the normally closed type that is connected within the electric circuit of the machine, in series with electromechanical actuator 5 (which may consist of a bimetallic element, a relay or a similar element), and is influenced by the logical level of output 23 of NOR gate 4 in such a way that it is excited only in the presence of logical level 1 in output 23, in the state in which the predetermined values of temperature, washing bath level and drum rotating speed have been reached, thereby effecting the opening of electric contact 31 and thus allowing the door to be unlocked and opened.
  • electromechanical actuator 5 which may consist of a bimetallic element, a relay or a similar element
  • output 23 of NOR gate 4 assumes logical level 0, thereby keeping transistor 26 inhibited and electromagnet 29 deenergized, which therefore keeps electric contact 31 closed and thus electromechanical actuator 5 fed.
  • the present locking means permits this operation only if all the values of temperature, washing bath level and drum rotating speed have reached the predetermined reference values, even in different time periods.
  • output 23 of the NOR gate is switched to logical level 1, switching on transistor 26 which feeds electromagnet 29 with voltage Vcc, which in turn effects the opening of electric contact 31 and thus the switch-off of electromechanical actuator 5.
  • the present locking means is equally suitable for installation in drying machines for laundry.
  • one provides only electronic comparators 1 and 3 for controlling the temperature of the drying air and the drum rotating speed, eliminates comparator 2 in view of the lack of a washing bath inside the drum of the machine, and connects these comparators with the electric components of the circuit which are identical to those described.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Washing And Drying Of Tableware (AREA)
  • Drying Of Solid Materials (AREA)
  • Feedback Control In General (AREA)
EP90101499A 1989-02-21 1990-01-25 A door locking means for a washing or drying machine for laundry Expired - Lifetime EP0384148B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90101499T ATE89044T1 (de) 1989-02-21 1990-01-25 Tuerverriegelungsvorrichtung fuer eine waschmaschine oder einen trockner.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8945711A IT1234686B (it) 1989-02-21 1989-02-21 Dispositivo di bloccaggio dello sportello per macchine lavabiancheria o asciugabiancheria.
IT4571189 1989-02-21

Publications (2)

Publication Number Publication Date
EP0384148A1 EP0384148A1 (en) 1990-08-29
EP0384148B1 true EP0384148B1 (en) 1993-05-05

Family

ID=11257516

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90101499A Expired - Lifetime EP0384148B1 (en) 1989-02-21 1990-01-25 A door locking means for a washing or drying machine for laundry

Country Status (5)

Country Link
EP (1) EP0384148B1 (it)
AT (1) ATE89044T1 (it)
DE (1) DE69001498T2 (it)
ES (1) ES2039967T3 (it)
IT (1) IT1234686B (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10154850C1 (de) * 2001-11-08 2003-06-18 Ellenberger & Poensgen Türverriegelung

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1250393B (it) * 1991-06-13 1995-04-07 Zanussi Elettrodomestici Dispositivo di bloccaggio della porta per macchine lavatrici o asciugatrici di biancheria.
IT1289378B1 (it) * 1996-05-22 1998-10-02 Electrolux Zanussi Elettrodome Lavabiancheria con bloccoporta istantaneo
US6036241A (en) * 1998-03-11 2000-03-14 Maytag Corporation Locking mechanism for an appliance door
DE10148452A1 (de) * 2001-10-01 2003-05-22 Bsh Bosch Siemens Hausgeraete Verfahren zum automatischen Steuern eines wasserführenden Haushaltgerätes und Haushaltgerät dazu
DE102006052428A1 (de) * 2006-11-07 2008-05-08 BSH Bosch und Siemens Hausgeräte GmbH Hausgerät zur Pflege von Wäschestücken, insbesondere Wäschetrockner
DE102010039665A1 (de) * 2010-08-24 2012-03-01 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zum Einnehmen eines sicheren Betriebszustands einer Einrichtung eines Hausgeräts, Schaltungsanordnung zum Betreiben eines Hausgeräts und Hausgerät
KR20170019052A (ko) 2015-08-11 2017-02-21 삼성전자주식회사 세탁기 및 그 제어방법

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2029941A1 (de) * 1970-06-18 1971-12-23 Licentia Gmbh Türverriegelung
DE2163449A1 (de) * 1971-12-21 1973-07-05 Miele & Cie Tuerverriegelung fuer eine wasch- oder schleudermaschine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10154850C1 (de) * 2001-11-08 2003-06-18 Ellenberger & Poensgen Türverriegelung
US6886868B2 (en) 2001-11-08 2005-05-03 Ellenberger & Poensgen Gmbh Door-locking assembly

Also Published As

Publication number Publication date
ATE89044T1 (de) 1993-05-15
ES2039967T3 (es) 1993-10-01
EP0384148A1 (en) 1990-08-29
IT1234686B (it) 1992-05-26
IT8945711A0 (it) 1989-02-21
DE69001498T2 (de) 1993-08-12
DE69001498D1 (de) 1993-06-09

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